TM 9-2520-246-34-1 2-20. REPAIR. This paragraph gives instructions to repair the transmission transfer case, covers, gear shafts, and gears. a. Smooth out any chips, scratches or burrs on gear shafts and gears with a honing stone. b. Weld cracks and small holes in housing and cover castings. Refer to TM 9-237. b. Drill out any bolts or studs broken off in tapped holes. d. Drill out threaded holes that are stripped or out-of-round to the next larger size and retap them. When putting together transmission transfer, use a bolt or stud the size of the newly tapped hole. 2-219